LONDON (Reuters) – Iran said on Wednesday that new sanctions imposed on it by Washington were an attempt to derail efforts to save the 2015 nuclear deal by its remaining signatories following the U.S. withdrawal from the accord.

FILE PHOTO: Cars of the Iranian delegation are parked outside a building of the at Diaoyutai state guesthouse in Beijing as Iranian Foreign Minister Mohammad Javad Zarif meets Chinese State Councillor and Foreign Minister Wang Yi, China, May 13, 2018. REUTERS/Thomas Peter

The U.S. Treasury on Tuesday imposed sanctions on Iran’s central bank governor, three other individuals and an Iraq-based bank, a week after U.S. President Donald Trump abandoned the deal Iran signed with world powers to curb its nuclear program.

Iran has described the sanctions as illegal and has warned that if talks to rescue the accord fail, it would ramp up its nuclear program to a level more advanced than before.

“With such destructive measures, the American government is trying to influence the will and decision of the remaining signatories of the JCPOA (nuclear agreement),” Iranian Foreign Ministry spokesman Bahram Qasemi was quoted as saying by Fars news agency.

British, French and German foreign ministers met in Brussels on Tuesday to see how they can save the nuclear deal without the United States, but appeared hard-pressed over how their companies could continue doing business with Iran once Washington begins to reimpose sanctions.

Iranian Foreign Minister Mohammad Javad Zarif said the meeting had been a good start, but he wanted to see guarantees materialize.

The Europeans and Iranians have now tasked experts to come up with measures quickly and will meet again in Vienna next week.